I forgot to mention, I am using a 9:1 UNUN at the feed point followed by 90’ of coax (LMR-400) serving as the counterpoise, followed by a good common mode line choke which then feeds into the shack with another 85’ length of LMR-400. The coaxial counterpoise is zip tied to my aluminum fence (~3’ high) for the first 75’. I couldn’t tell you if this coax is capacitively coupling to the fence, but I bet that it is. I also tried adding a second 70' counterpoise (using the same wire as what I used for the antenna), but it actually made things worse.
I forgot to mention, I am using a 9:1 UNUN at the feed point followed by 90’ of coax (LMR-400) serving as the counterpoise, followed by a good common mode line choke which then feeds into the shack with another 85’ length of LMR-400. The coaxial counterpoise is zip tied to my aluminum fence (~3’ high) for the first 75’. I couldn’t tell you if this coax is capacitively coupling to the fence, but I bet that it is. I also tried adding a second 70' counterpoise (using the same wire as what I used for the antenna), but it actually made things worse.